Frenchman Mountain Dolostone (IMAGE) University of Nevada, Las Vegas Caption Quartermaster Canyon (Arizona) exposure, with stratigraphic units labeled. Frenchman Mountain Dolostone here is 117m thick. Credit Stephen Rowland/UNLV Usage Restrictions use photo credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.